[Xen-changelog] [xen-unstable] mem_event: use C99 initializers for mem_event_request_t users

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Olaf Hering <olaf@xxxxxxxxx>
# Date 1329772592 -3600
# Node ID 0c3d19f40ab145d101de84051c3e00eef17fa1cb
# Parent  626fa29dc04d7ed77ae16cfee8a767ff6bb819ad
mem_event: use C99 initializers for mem_event_request_t users

Use C99 initializers for mem_event_request_t users to make sure req is
always cleared, even with local debug patches that shuffle code around
to have a single exit point.
The common case is to use and send req, so it does not add significant
overhead to always clear req.

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
Acked-by: Tim Deegan <tim@xxxxxxx>
Committed-by: Tim Deegan <tim@xxxxxxx>
---


diff -r 626fa29dc04d -r 0c3d19f40ab1 xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c    Mon Feb 20 22:09:40 2012 +0100
+++ b/xen/arch/x86/hvm/hvm.c    Mon Feb 20 22:16:32 2012 +0100
@@ -4302,7 +4302,7 @@
 {
     struct vcpu* v = current;
     struct domain *d = v->domain;
-    mem_event_request_t req;
+    mem_event_request_t req = { .reason = reason };
     int rc;
 
     if ( !(p & HVMPME_MODE_MASK) ) 
@@ -4321,9 +4321,6 @@
     else if ( rc < 0 )
         return rc;
 
-    memset(&req, 0, sizeof(req));
-    req.reason = reason;
-
     if ( (p & HVMPME_MODE_MASK) == HVMPME_mode_sync ) 
     {
         req.flags |= MEM_EVENT_FLAG_VCPU_PAUSED;    
diff -r 626fa29dc04d -r 0c3d19f40ab1 xen/arch/x86/mm/p2m.c
--- a/xen/arch/x86/mm/p2m.c     Mon Feb 20 22:09:40 2012 +0100
+++ b/xen/arch/x86/mm/p2m.c     Mon Feb 20 22:16:32 2012 +0100
@@ -913,7 +913,7 @@
 void p2m_mem_paging_drop_page(struct domain *d, unsigned long gfn,
                                 p2m_type_t p2mt)
 {
-    mem_event_request_t req;
+    mem_event_request_t req = { .gfn = gfn };
 
     /* We allow no ring in this unique case, because it won't affect
      * correctness of the guest execution at this point.  If this is the only
@@ -924,8 +924,6 @@
         return;
 
     /* Send release notification to pager */
-    memset(&req, 0, sizeof(req));
-    req.gfn = gfn;
     req.flags = MEM_EVENT_FLAG_DROP_PAGE;
 
     /* Update stats unless the page hasn't yet been evicted */
@@ -962,7 +960,7 @@
 void p2m_mem_paging_populate(struct domain *d, unsigned long gfn)
 {
     struct vcpu *v = current;
-    mem_event_request_t req;
+    mem_event_request_t req = { .gfn = gfn };
     p2m_type_t p2mt;
     p2m_access_t a;
     mfn_t mfn;
@@ -980,8 +978,6 @@
     else if ( rc < 0 )
         return;
 
-    memset(&req, 0, sizeof(req));
-
     /* Fix p2m mapping */
     gfn_lock(p2m, gfn, 0);
     mfn = p2m->get_entry(p2m, gfn, &p2mt, &a, p2m_query, NULL);
@@ -1011,7 +1007,6 @@
     }
 
     /* Send request to pager */
-    req.gfn = gfn;
     req.p2mt = p2mt;
     req.vcpu_id = v->vcpu_id;
 

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